Fuel-economizer.



w. E. FRQST.

FUEL ECONOMIZER.

APPLICATION FILED FEB. 4, 1915.

l 1 72, 12:8 Patented Feb. 15, 1916.

2 SHEETSSHEET l- V wirtheoom I 2% I u f W. E. FROST.

FUEL ECONOMIZER.

APPLICATION HLED FEB. 4, 1915.

1 1 '72, 1 28 Patented Feb. 15, 1916.

2 SHEETS-SHEET 2.

UNHE

ATES ATNT @FFliQ.

WALTER E. FROST, 0F AUBURN, MAINE, ASSIGNOR TO FRED O. WATSON, OF AUBURN,

' MAINE.

runn-ncononrznn.

Specification of Letters Patent.

Patented Feb. 15, 1916.

Application filed February 4, 1915. Serial No. 6,120.

To all whom it may concern 1 Be it known that I, WALTER E. Fnosr, a citizen of the United States, residing at Auburn, in the county of Androscoggin and State of Maine, have invented certain new and useful Improvements in FuelEconominers; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relatesto improvements in attachments for heating stoves and furnaces for supplying atmospheric air to the interior of the combustion chamber of the stove and thereby greatly economizing in the fuel used.

@ne object of the invention is to provide a simply constructed device of this character for supplying air in a highly heated condition directly at the entrance to the funnel or smoke pipe whereby a complete commingling of the air with the gases is insured thus causing the combustible gases to be burned.

Another object is to provide means whereby the air inlet is automatically closed on the opening of the coaling door of the stove or furnace with which the attachment is 0on nected,

Another object is to provide a simply constructed air spreading device arranged in the path of the incoming heated air where by the air is spread out and thus thoroughly commingled with the products of combustion.

With these and other objects in View the invention consists of certain novel features of construction, and the combination and arrangement of parts as will hereinafter be more fully described and claimed.

In the accompanying drawings: Figure 1 is a side elevation with parts broken out of a cooking stove with this invention applied; Fig. 2 is a transverse section taken on line 2-2 of Fig. 1; Fig. 3 is a detail perspective view with parts broken out, of the hot air pipe with itsclosure arranged in juxtaposition and open; Fig. 4: is a similar view of the cold air pipe. Fig. 5 is a side elevation of a furnace with parts broken out showing this invention applied and the hot air pipe open to the atmosphere. Fig. 6 is a detail side elevation showing the application of the spreader.

in Figs. 1 to 3 the device is shown applied to a cooking stove which is equipped with the usual smoke pipe 1 atfixed in the usual manner and having an ordinary check damper 2 therein. Disposed within the pipe 1 and opening through one wall thereof at a point between the damper 2 and the stove is an air pipe or tube 3 which is disposed within the pipe 1 and has a right angular screw threaded arm 3 at its outer end extending through the smoke pipe opening outside the pipe 1. A nut 23' is arranged on the screw threaded end 3 on the inside of the smoke pipe, and secured on the outside of the latter is a nut member 13 having a laterally disposed pivot ear la, said pivot car 14 being provided with a screw threaded aperture 15. Disposed adjacent the nut member 13 is a cover plate & having a pivot ear 4 extending laterally from one edge thereof and an extension 1 projecting lat erally from its opposite edge. The pivot ear 4 is provided with an aperture 16 through which extends a threaded bolt 17 having a head 18 at one end. The threaded end of the bolt 17 is secured in the threaded aperture 15 and the head 18 thereof abuts the outer face of the cover plate 4 and holds the latter in frictional contact with the nut member 13. A lug 19 carried on the outer face of the nut member 13 limits the movement of the cover plate 1. The hot air tube 3 is shown extending longitudinally of the pipe 1; on the interior thereof and projects beyond the inner end of said pipe into the stove S. This projecting end of the pipe or tube- 3 is designed to be located in the combustion chamber of the stove adjacent the smoke outlet therefor and is provided on said end with a heating member herein shown in the form of an upright coil 7 which is substantially rectangular in form being composed of two parallel arms connected by a right angular connection and with its mouth or discharge end 8 opening downwardly to discharge the fresh heated air into the path of the outflowing unconsumed gases of combustion and thus cause them to be burned and thereby maintain a good body of fire in the stove with a small consumption of fuel. This arrangement of coil provides for its disposition in a very small space and yet presents a maximum heatingsurface with its discharge end opening into the path of the outflowing gases.

In Fig. 6 a spreader 9 is shown mounted on the projecting end of the pipe 3 where it extends into the combustion chamber of the stove and which is designed to distribute the incoming heated air over a large area of the combustion chamber and thereby facilitateits mingling with the products of combustion. This spreader 9 is here shown 1n the form of a disk although obviously it may be in any other form carried by and spaced from the discharging end or mouth of thepipe 3 and against which the hot air is designed to impinge and be spread outwardly in a radial direction into the surrounding atmosphere. A cold air pipe 10 is also shown mounted in the smoke pipe 1 on the side of the damper 2 opposite to that on which the hot air pipe 3 is disposed and opens at one end through the sidewall of the pipe 1 where it is provided with a pivoted closure for controlling the air suppliedthrough said pipe or for cutting it off when desired. This pipe 10 preferably extends up into the smoke flue for a distance of :ibOUttWO feet or more or less so that it will not draw directly on the fire and yet will facilitate the carrying off of the products of combustion. When the cold air draft pipe is open the smoke flue check 2 is closed and the closure to the hot air pipe 3 is preferably shut at night when it is desired to maintain a low temperature.

In Figs. -1- and 5 the attachment is shown applied to a furnace and is constructed similarly to that above described except that the arm of the closure' lin addition to being connected to a coiled spring 5 is connected with one end of a flexible element 11 which passes over suitable pulleys 12 down to the coaling door of the furnace where it is connected under such tension so that when saidcoaling door is closed, sufficient strain will be exerted on the element 11 to open the closure 4; against the tension of its spring 5 as shown thereby permitting outside air to pass into the pipe 3 and be discharged into the combustion chamber. Immediately the coaling. door is opened a slack o'r looseness is effected in the element 11 so that the spring 5, exerts its tension to close the closure 4 of the pipe 3 and thus cut off any air'supply to the combustion chamber by this means therebypreventing the formation of smoke in the stove during the coaling operation.

:From the above description it will be obvious that when the closure 4: is held open Copies of this patent may be obtained for five cents eaclnby addressing the Commissioner of Patents, Washington, D. G.

on the closing of the door of the furnace, or in any other manner, outside atmospheric air will enter the pipe" 3 through said open end and become thoroughly heated in its passage through said pipe. The coil at the end of the pipe also assists in heating the air so that when it 1s dischargedtherefrom I it will be in a highly heated condition, thus facilitating its mingling with the products of combustion and thereby causing them to be burned. When this attachment is employed much less coal isconsumed for producing a maximum amount of heat and only about one half as much ashes are formed and practically no dust.

I claim as my invention: Y

A device to be used in connection with a stove having a smoke pipe provided with an opening through its side wall at a point spaced from its connection with said stove, an air tube disposed in said smokepipe and extending into said stove, said air tube having an angular arm at one end, the end of said arm being screw threaded and extending into said smoke pipe opening, a nut arranged on the screw threaded end of said arm on the inside of the smoke pipe, a nut member secured on the threaded end of said arm on the outside of the smoke pipe, said nut member having a laterally disposed pivot ear,

the latter being provided with screw threaded aperture, a cover plate disposed adjacent said nut member, a pivot ear extending laterally from one edge of said cover plate and provided with an aperture therein, an extension projecting laterally fromthe opposite edge of said cover plate to provide a handle for the latter, a threaded pivot bolt havinga head at one end thereof, said pivot bolt extending through the last mentioned aperture and having its threaded end engaged with the screw threaded aperture of said nut member, the head of said pivot boltabutting the outer face of said cover plate and holding the latter in frictional contact with said nut member, and a lug on said nutmember to limit the movement of said cover plate.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

WALTER nraosr.

Witnesses:

' TAsoUsA'rWoon,

FRED O. WA'rsoNV 

